Classifications

• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
  • A24D1/00—Cigars; Cigarettes
• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
  • A24D1/00—Cigars; Cigarettes
  • A24D1/02—Cigars; Cigarettes with special covers
  • A24D1/027—Cigars; Cigarettes with special covers with ventilating means, e.g. perforations
• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
  • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
  • A24D3/04—Tobacco smoke filters characterised by their shape or structure
  • A24D3/043—Tobacco smoke filters characterised by their shape or structure with ventilation means, e.g. air dilution
• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
  • A24D1/00—Cigars; Cigarettes
  • A24D1/04—Cigars; Cigarettes with mouthpieces or filter-tips
  • A24D1/045—Cigars; Cigarettes with mouthpieces or filter-tips with smoke filter means
• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
  • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
  • A24D3/02—Manufacture of tobacco smoke filters
  • A24D3/0275—Manufacture of tobacco smoke filters for filters with special features
  • A24D3/0283—Manufacture of tobacco smoke filters for filters with special features with means for a non-axial smoke flow
• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
  • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
  • A24D3/04—Tobacco smoke filters characterised by their shape or structure
• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
  • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
  • A24D3/06—Use of materials for tobacco smoke filters
  • A24D3/08—Use of materials for tobacco smoke filters of organic materials as carrier or major constituent
  • A24D3/10—Use of materials for tobacco smoke filters of organic materials as carrier or major constituent of cellulose or cellulose derivatives

Definitions

• This invention relates to a filter for use with a smoking article such as a cigarette.
• the present invention provides an improved way of admitting ventilation and air into the filter which is less complex to construct and can readily be accommodated within the smoking article manufacturing process.
• a filter for a smoking article comprising an elongate body of filter material, an inner wrapper comprising first and second regions of non-porous material around and spaced apart along the length the filter material to define a gap that acts as a ventilation zone, and an outer wrapper overlying the inner wrapper and configured to allow ventilation air to be drawn through the ventilation zone and pass into the filter material through the outer wrapper and longitudinally between inner wrapper and the outer wrapper.
• At least one the first and second regions of the inner wrapper may comprise a portion of non porous tipping paper and conveniently both the first and second regions of the inner wrapper comprise first and second portions of non porous tipping paper.
• At least one of the first and second regions of the inner wrapper can comprise a non porous coating around the filter such as glue that attaches the outer wrapping to the inner wrapping.
• a spacer member such as a corrugated sheet may be provided between the inner and outer wrappers to facilitate the passage of ventilation air longitudinally between them.
• the first region of inner wrapper may be more adjacent to the mouth end than the second region, and the outer wrapper can be attached to the first region of the inner wrapper such that ventilation air cannot substantially be drawn into the ventilation zone between the outer wrapper and the first region of the inner wrapper.
• the outer wrapper may comprise naturally porous tipping paper and ventilation holes may be formed in the outer wrapper and/or in the body of filter material in the ventilation zone.
• a rod of smokeable material can attach to the filter for example by means of the inner wrapper, and the outer wrapper may extend beyond the inner wrapper on the rod.
• the invention also includes a method of manufacturing a smoking article comprising: wrapping an elongate body of filter material with an inner wrapper comprising first and second regions of non-porous material spaced apart along the length the filter material to define a gap to act as a ventilation zone, wrapping the filter material with an outer wrapper overlying the inner wrapper, and coupling the outer wrapper to the inner wrapper such as to allow ventilation air to be drawn through the ventilation zone and pass into the filter material through the outer wrapper and longitudinally between inner wrapper and the outer wrapper.
• Figure 1 is a schematic illustration of a filter cigarette
• Figure 2 illustrates the interior structure of the filter of Figure 1 in more detail
• Figure 3 illustrates an alternative configuration for the filter of Fig. 2, in which the outer wrapper is longer than the inner wrapper
• Figure 4 illustrates another alternative, in which the outer wrapper has a shorter length than the inner wrapper
• Figure 5 illustrates the filter configuration with ventilation holes added in the outer wrapper
• FIG. 6 corresponds to Figure 5, with ventilation holes additionally provided in the filter body,
• Figure 7 illustrates an alternative configuration with a circumferential corrugated spacer member between the inner and outer wrappers
• Figure 8 is an end view of the filter illustrated in Figure 7,
• Figure 9 illustrates a further filter configuration in which one of the non porous portions of tipping paper forming the inner wrapper is replaced by a coating of glue, and - A -
• Figures 1OA — 1OC illustrate steps in the manufacture of a cigarette incorporating a filter as illustrated in any of the preceding Figures.
• a smoking article in the form of a cigarette 1 comprises a tobacco rod 2 in a paper wrap 3 attached to a filter 4.
• the filter 4 has a mouth end 5 and a tobacco rod end 6.
• the filter 4 may comprise a generally cylindrical body of filter material 7 in a plug wrap typically made of paper (not shown in Fig. 1).
• a smoker draws on the mouth end 5 so that the smoke is drawn from the burning tobacco rod into the tobacco rod end 6 of the filter, so as to be filtered on its passage to the mouth end 5.
• the structure of the filter 4 is illustrated in more detail in Figure 2.
• the body 7 of filter material may typically comprise a cellulose acetate tow contained within plug wrap 8, in an elongate, generally cylindrical configuration.
• Filter bodies for cigarettes are well known ⁇ r ⁇ and may contain additional materials to assist filtering, for example activated carbon and the like and may also include flavourants, for example menthol.
• the filter body 7 and plug wrap 8 are wrapped with an inner wrapper that comprises first and second regions 9, 10 of non-porous material which may comprise tipping paper portions that are wrapped around and spaced apart along the length of the body of the filter material 7 to define a gap 11 that acts as a ventilation zone to admit air into the filter material 7 in order to dilute the smoke inhaled by the smoker though the mouth end 5.
• the second portion 10 of the non-porous tipping paper overlaps in region 12 the end of the tobacco rod 2 that abuts the filter body 7.
• Both of the inner wrapper portions 9, 10 are glued in place and so the portion 10 retains the filter 4 on the tobacco rod 2.
• a porous outer wrapper 13 conveniently formed of naturally porous tipping paper is wrapped around the inner wrapper 9, 10 and glued in an area 14 illustrated in hatched outline.
• Ventilation air can enter the ventilation zone 11 when a smoker draws on the mouth end 5 of the cigarette along two paths. Firstly, the ventilation air can pass through the porous outer wrapper 13 in the direction of arrows 14 so as to enter the ventilation zone 11. Secondly, ventilation air can be drawn in the direction of arrow 16 though the space between the outer wrapper 13 and the inner wrapper portion 10, it being understood that the outer wrapper 13 is not glued to the inner wrapper portion 10 so that air can be admitted though the circumferential opening between inner wrapping portion 10 and end 17 of the outer wrapper 13 in the direction of arrow 18.
• This arrangement has the advantage that if the user holds the filter between their fingers, although the action will tend to close the passageway that extends in the direction of arrow 16 between the inner and outer wrappers 10, the closure will only occur in typically two radial portions where the fingers of the user grip the filter, thereby leaving the remainder of the circumferential passageway open for use.
• the users fingers may obturate the passage of air in the direction of arrow 15 in regions where zone 11 is gripped, only a portion of the total surface area that can admit ventilation air through the outer wrapper 13 is blocked, leaving the major part free to admit air in response to the user drawing smoke through the filter.
• the filter arrangement provides a highly reliable configuration for admitting ventilation air into the filter to dilute smoke drawn by the user.
• Figure 3 illustrates a modification of the configuration shown in Figure 2, in which edge 17 of the outer wrapper extends longitudinally over the tobacco rod, beyond the corresponding edge 10a of the second, inner wrapper portion 10.
• the end 17 of the outer wrapper 13 stops short of the join between the filter body 7 and the tobacco rod 2.
• Figure 5 illustrates a further modification in which ventilation holds 19 are formed in the outer wrapper 13 in the region of the ventilation zone 11.
• ventilation holes 20 may be formed in the body 7 of the filter material itself.
• the ventilation holes 19, 20 may be formed by laser perforation in a manner known per se.
• a spacer member 21 in the form of a corrugated paper structure may be included between the outer wrapper 13 and the inner wrapper in the region of ventilation zone 11 and the second portion 10 of the inner wrapper.
• the corrugated member 21 acts as a spacer and provides channels 22 extending longitudinally of the cigarette to facilitate the passage of ventilation air between the inner and outer wrappers 10, 13 in the direction of arrow 18.
• the first paper wrapper portion 9 of the inner wrapper portion is replaced by a non- porous layer of glue that attaches the outer wrapper 13 directly to the plug wrap in region 23 adjacent the mouth end.
• the glue provides a non porous coating between the mouth end 5 of the filter and the ventilation zone 11 and thus acts as the first region 9 of the inner wrapper.
• FIG. 10 A process for manufacturing cigarettes incorporating the filters according to the invention is illustrated schematically in Figure 10.
• a rod of filter material 4 wrapped with plugwrap (not shown) of a length suitable for two cigarettes, is brought into alignment with tobacco rods 2, 2' in order to manufacture two cigarettes end-to-end.
• the tobacco rods 2, 2' and the filter material 4 are brought into an abutting relationship as shown in Fig. 1OB and then as shown in Fig. 1OC are wrapped with inner wrappers 9, 10 & 10' that are glued around the middle of the filter material 4 and the butt joints between the filter material 4 and the tobacco rods, 2, 2' respectively.
• the inner wrapper 9 is twice the width of the wrappers 10, 10'.
• the inner wrappers 9 and 10, 10' are spaced apart by regions 11, 11' which forms ventilation zones.
• the resulting configuration is shown in Fig. 1OD
• the body 4 filter material is then wrapped with outer wrapper 13, of naturally porous tipping paper.
• the tipping paper 13 is glued only to the inner wrapper 9 and not to the inner wrappers 10, 10' or the ventilation zones 11, 11'.
• the wrapper 9 may be pre-coated with a glue to assist in the process.
• the resulting configuration is illustrated in Fig. 1OF and comprises two cigarettes each with a filter as previously described, configured end -o-end. The two cigarettes are then separated in a cutting step as illustrated in Fig. 1OG so as to form cigarettes 1, 1'
• the width of the outer wrapper 13 may be modified to achieve any of the configurations illustrated in Figures 2, 3 or 4 and furthermore, ventilation holes, 19, 20 may be produced by an on-machine laser technique in the manner known per se.
• the filter has been described as comprising a single body of filter material, it may be a multi-section filter, with each section having respective, different filtering characteristics.
• smoking article includes smokeable products such as cigarettes, cigars and cigarillos whether based on tobacco, tobacco derivatives, expanded tobacco, reconstituted tobacco or tobacco substitutes and also heat-not-burn products.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Cigarettes, Filters, And Manufacturing Of Filters (AREA)

Priority Applications (12)

Applications Claiming Priority (2)

Publications (1)

Family

ID=40262371

Family Applications (1)

Country Status (17)

Cited By (4)

Families Citing this family (15)

Citations (6)

Family Cites Families (24)

• 2008
  • 2008-12-01 GB GBGB0821803.4A patent/GB0821803D0/en not_active Ceased
• 2009
  • 2009-11-20 RU RU2011126603/12A patent/RU2520878C2/ru not_active IP Right Cessation
  • 2009-11-20 CA CA2742396A patent/CA2742396C/en not_active Expired - Fee Related
  • 2009-11-20 MY MYPI2011002060A patent/MY169793A/en unknown
  • 2009-11-20 AU AU2009321582A patent/AU2009321582C1/en not_active Ceased
  • 2009-11-20 UA UAA201108154A patent/UA101706C2/uk unknown
  • 2009-11-20 EP EP09764763A patent/EP2373186A1/de not_active Withdrawn
  • 2009-11-20 WO PCT/EP2009/065529 patent/WO2010063591A1/en active Application Filing
  • 2009-11-20 CN CN200980148227.8A patent/CN102231958B/zh not_active Expired - Fee Related
  • 2009-11-20 JP JP2011537944A patent/JP5739345B2/ja not_active Expired - Fee Related
  • 2009-11-20 BR BRPI0922161A patent/BRPI0922161A2/pt not_active Application Discontinuation
  • 2009-11-20 US US13/132,284 patent/US8807143B2/en not_active Expired - Fee Related
  • 2009-11-20 MX MX2011004302A patent/MX2011004302A/es active IP Right Grant
  • 2009-11-20 KR KR1020117015134A patent/KR20110096560A/ko active Application Filing
  • 2009-11-20 KR KR1020177005355A patent/KR20170024158A/ko not_active Application Discontinuation
  • 2009-12-01 AR ARP090104633A patent/AR076448A1/es not_active Application Discontinuation
• 2011
  • 2011-05-31 CL CL2011001280A patent/CL2011001280A1/es unknown
• 2012
  • 2012-01-31 HK HK12100878.3A patent/HK1160362A1/zh not_active IP Right Cessation

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